iron and other metallic salts that cause rust or a
yellow discoloration. If left in fabrics these
chemicals cause odors and discoloration after
Another reason for using a sour in the last
rinse is that it removes sodium bicarbonate, which
is normally in the rinse water. Even though
other chemicals may have rinsed out, sodium
bicarbonate remains. It is not injurious to fabrics
in itself, but when subjected to the heat of
flatwork ironers, presses, or hand ironers, it is
converted to sodium carbonate which is quite
alkaline and in sufficient concentration can cause
injury to fabrics.
Souring also decomposes any oxidizing bleach
left in a load, prevents discoloration, and helps
to sterilize the clothes. In addition, sour sets acid
dyes often used in bright-colored fabrics and
preserves the tensile strength of fibers. Laundry
sour also removes rust stains.
There are many different laundry sours of
varying strengths, including acetic acid, fluorosilic
acid, hydrofluoric acid, and several types of
fluoride (ammonium, sodium acid, and sodium
silico). Fluoride is generally used. The sour
required for use is combined in the powdered form
with powdered blue (NSN 7930-00-205-2882).
Starch is applied to wearing apparel and other
linens to give them body, smoothness, and an
improved appearance. Only cotton fabrics should
be starched in the ships laundry. DO NOT starch
synthetic and synthetic blend fabrics or work
clothes. The amount of starch used should be the
amount indicated on the formula.
Starching should only be done in the
automatic mode; however, when you have to do
it manually, follow these steps:
1. Do not drain the sour/blue bath. Reduce
water to a low level with the water at temperature
indicated on the formula. Add the proper amount
2. Run the machine for 4 minutes, long
enough to allow the starch to penetrate the shirts.
3. Drain the starch from the machine while
it is running to prevent the starch from settling
on the load.
Washer extractors installed aboard ship differ
mainly in load capacity. The Naval Sea Systems
Command (NAVSEA) publishes the N a v y
Laundry and Dry-Cleaning Equipment Catalog
(Tech Manual #S6152-B1-CAT-010). This catalog
is used by the Navy to obtain information for
identification, selection, and procurement of
standard naval shipboard laundry and dry-
cleaning equipment. The washer extractors used
by the Navy are listed in figure 5-13. This catalog
includes several different types and sizes of washer
extractors, however, the Edro (Dyna Wash) and
the Pellerin Milnor washers are the ones most
widely used by the Navy.
Washer extractors are basically made up into
two parts, the outer shell and the cylinder. The
shell holds the water and cleaning ingredients,
while the cylinder hold the clothes.
The cylinder is perforated to allow water and
suds in the bottom of the shell to enter and clean
the clothes during the wash cycle. The washer
extractor then extracts the water from the cylinder
by using centrifugal force. A separate extract
motor spins the cylinder at a high speed to do this.
OPERATION OF THE WASHER
EXTRACTOR (EDRO MODEL)
The washer extractor manufactured by the
Edro Corporation, better known as the Dyna
Wash, is procured in three sizes200-, 100-,
or 60-pound sizes. The 100-pound Dyna Wash
(including basic parts) is illustrated in figure 5-14.
This washer extractor was designed to provide an
easy and safe method of washing clothes,
therefore, training personnel to operate the
machine is easy. Since the washer extractor is
automatic, the only thing the operator will have
to do is load, add supplies, and unload.
WASHER EXTRACTOR CONTROLS
The Dyna Wash control system consists of two
parts, the control panel and the programmer. The
control panel is illustrated in figure 5-15. This
panel may look slightly different on some models;
however, the purpose of the basic controls on this
panel is the same.
The control switch energizes all electricity to
the control panel and programmer. This control
switch must be energized before you can use any
of the basic controls. The basic controls on
the control panel are used when loading and
unloading the washer. By depressing the jog
switch simultaneously with the reverse or forward
switch, the washer cylinder will rotate in that